/*************************************************************************
 *
 *  The Contents of this file are made available subject to the terms of
 *  either of the following licenses
 *
 *         - GNU Lesser General Public License Version 2.1
 *         - Sun Industry Standards Source License Version 1.1
 *
 *  Sun Microsystems Inc., October, 2000
 *
 *  GNU Lesser General Public License Version 2.1
 *  =============================================
 *  Copyright 2000 by Sun Microsystems, Inc.
 *  901 San Antonio Road, Palo Alto, CA 94303, USA
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License version 2.1, as published by the Free Software Foundation.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA  02111-1307  USA
 *
 *
 *  Sun Industry Standards Source License Version 1.1
 *  =================================================
 *  The contents of this file are subject to the Sun Industry Standards
 *  Source License Version 1.1 (the "License"); You may not use this file
 *  except in compliance with the License. You may obtain a copy of the
 *  License at http://www.openoffice.org/license.html.
 *
 *  Software provided under this License is provided on an "AS IS" basis,
 *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
 *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
 *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
 *  See the License for the specific provisions governing your rights and
 *  obligations concerning the Software.
 *
 *  The Initial Developer of the Original Code is: IBM Corporation
 *
 *  Copyright: 2008 by IBM Corporation
 *
 *  All Rights Reserved.
 *
 *  Contributor(s): _______________________________________
 *
 *
 ************************************************************************/
#ifndef _EXPLODE_HXX_
#define _EXPLODE_HXX_

#include <tools/stream.hxx>

class HuffmanTreeNode
{
public:
	HuffmanTreeNode * left;
	HuffmanTreeNode * right;
	sal_uInt32 value;
	
	HuffmanTreeNode(sal_uInt32 value = 0xffffffff, HuffmanTreeNode * left = NULL, HuffmanTreeNode * right = NULL) ;
	~HuffmanTreeNode() ;	
	HuffmanTreeNode * InsertNode(sal_uInt32 nValue, const sal_Char * pInCode);
	HuffmanTreeNode * QueryNode(const sal_Char *pCode);
	sal_uInt32 QueryValue(const sal_Char *pCode);
};


/**
 * @brief
 * define the function type for input read, output write
 */
#define CHUNK 16384
#define MAXWIN 4096		/* maximum window size */
class Decompression
{
public:
	Decompression(SvStream * pInStream, SvStream * pOutStream);
	~Decompression()
	{
		delete m_Tree1;
		delete m_Tree2;
	};
	/**
	 * @brief
	 * decompress from instream to outstream
	 */
	sal_Int32 explode();
	sal_uInt32 ReadBits(sal_uInt16 iCount, sal_uInt32 & nBits) ;
	sal_uInt32 Decode(HuffmanTreeNode * pRoot);

	/**
	 * @brief
	 * compressed/decompressed stream
	 */
	SvStream *m_pInStream;
	SvStream *m_pOutStream;

	sal_uInt32 m_nCurrent4Byte;   // bit buffer
	sal_uInt32 m_nBitsLeft;		// number of bits remained in bit buffer

	sal_uInt8 m_Buffer[CHUNK];	// input byte buffer
	sal_uInt8 *m_pBuffer;			// pointer to input buffer
	sal_uInt32 m_nBytesLeft;		// number of bytes remained in byte buffer	

	sal_uInt8 m_Output[MAXWIN];	// output byte buffer
	sal_uInt32 m_nOutputBufferPos;	// pointer to output buffer

	sal_uInt32 m_iArrayOfM[16];


	HuffmanTreeNode *m_Tree1, *m_Tree2;

	void ConstructTree1();
	void ConstructTree2();
	void fillArray();
	void ToString(sal_uInt32 nBits, sal_Char *pChar, sal_uInt32 nLen);
};
#endif
